Preparation method of porous hollow carbon microsphere co-doped with oxygen and nitrogen
A technology of co-doping and carbon microspheres, which is applied in the field of porous carbon materials, can solve the problems of difficult control of the size and shape of carbon spheres, easy adhesion of particles, and unfavorable industrialization promotion. Effects of industrialization, lower quality requirements
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Embodiment 1
[0037] Dissolve alkali lignin and sodium hydroxide with a mass ratio of 5:1 in deionized water to form a solution, control the mass fraction of alkali lignin and sodium hydroxide in the solution to be 10%, and stir at room temperature for 2h; The final solution was transferred to the spray drying equipment, and the composite microspheres were obtained by the spray drying method; the composite microspheres were placed in the air for pre-oxidation treatment, and the temperature was raised to 200°C at a heating rate of 0.1°C / min, and kept at a constant temperature for 20h. Then cool naturally to room temperature; place the pre-oxidized composite microspheres in a nitrogen atmosphere, raise the temperature to 700 °C at a rate of 10 °C / min, and carbonize at a constant temperature for 2 hours, then cool naturally to room temperature; use a concentration of 2.0 mol / Soak the carbonized composite microspheres in 1 L of hydrochloric acid solution to remove the inorganic matter, then was...
Embodiment 2
[0040] Dissolve kraft lignin and potassium carbonate with a mass ratio of 3:1 in deionized water to form a solution, control the mass fraction of kraft lignin and potassium carbonate in the solution to 20%, and stir at room temperature for 1 h; The final solution was transferred to the spray drying equipment, and the composite microspheres were obtained by the spray drying method; the composite microspheres were placed in the air for pre-oxidation treatment, and the temperature was raised to 270 °C at a heating rate of 1 °C / min, and kept at a constant temperature for 12 hours. Then cool naturally to room temperature; place the pre-oxidized composite microspheres in an argon atmosphere, raise the temperature to 800 °C at a rate of 2 °C / min, and carbonize at a constant temperature for 0.5 h, then cool naturally to room temperature; use a concentration of 1.0 Soak the carbonized composite microspheres in mol / L sulfuric acid solution to remove the inorganic matter, then wash them w...
Embodiment 3
[0043] Dissolve lignosulfonate and calcium chloride with a mass ratio of 2:1 in deionized water to form a solution, control the mass fraction of lignosulfonate and calcium chloride in the solution to 40%, and stir at room temperature 10h; transfer the stirred solution to a spray drying device, and obtain composite microspheres by spray drying; place the composite microspheres in the air for pre-oxidation treatment, and raise the temperature to 300°C at a heating rate of 5°C / min, and Keep the temperature at a constant temperature for 2 h, and then cool down to room temperature naturally; place the pre-oxidized composite microspheres in an argon atmosphere, raise the temperature to 900 °C at a rate of 30 °C / min, and carbonize at a constant temperature for 1 h, and then cool down to room temperature naturally; Soak the carbonized composite microspheres in a nitric acid solution with a concentration of 0.5mol / L to remove the inorganic matter, then wash with water until the pH value...
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